| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_16_3_12.html | Chapter 1. calc_tutorial_16_3_12
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| http://digfir-published.macmillanusa.com/calc_tutorial/calc_tutorial_16_3_12_dlap.xml | DLAP questions | 50ccb53fb11c0fc57e000000 |